US9677003B2 - Liquid crystal display device and method for producing the same - Google Patents

Liquid crystal display device and method for producing the same Download PDF

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Publication number
US9677003B2
US9677003B2 US14/115,319 US201214115319A US9677003B2 US 9677003 B2 US9677003 B2 US 9677003B2 US 201214115319 A US201214115319 A US 201214115319A US 9677003 B2 US9677003 B2 US 9677003B2
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liquid crystal
carbon atoms
group
display device
crystal display
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US20150022750A1 (en
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Shinji Ogawa
Yoshinori Iwashita
Takeshi Kuriyama
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Shijiazhuang Chengzhi Yonghua Display Material Co Ltd
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DIC Corp
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Assigned to SHIJIAZHUANG CHENGZHI YONGHUA DISPLAY MATERIAL CO., LTD. reassignment SHIJIAZHUANG CHENGZHI YONGHUA DISPLAY MATERIAL CO., LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: DIC CORPORATION
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    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K19/00—Liquid crystal materials
    • C09K19/52—Liquid crystal materials characterised by components which are not liquid crystals, e.g. additives with special physical aspect: solvents, solid particles
    • C09K19/54—Additives having no specific mesophase characterised by their chemical composition
    • C09K19/56—Aligning agents
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G73/00—Macromolecular compounds obtained by reactions forming a linkage containing nitrogen with or without oxygen or carbon in the main chain of the macromolecule, not provided for in groups C08G12/00 - C08G71/00
    • C08G73/06—Polycondensates having nitrogen-containing heterocyclic rings in the main chain of the macromolecule
    • C08G73/10—Polyimides; Polyester-imides; Polyamide-imides; Polyamide acids or similar polyimide precursors
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L79/00—Compositions of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing nitrogen with or without oxygen or carbon only, not provided for in groups C08L61/00 - C08L77/00
    • C08L79/04—Polycondensates having nitrogen-containing heterocyclic rings in the main chain; Polyhydrazides; Polyamide acids or similar polyimide precursors
    • C08L79/08—Polyimides; Polyester-imides; Polyamide-imides; Polyamide acids or similar polyimide precursors
    • C—CHEMISTRY; METALLURGY
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    • C09K19/00—Liquid crystal materials
    • C09K19/04—Liquid crystal materials characterised by the chemical structure of the liquid crystal components, e.g. by a specific unit
    • C09K19/06—Non-steroidal liquid crystal compounds
    • C09K19/08—Non-steroidal liquid crystal compounds containing at least two non-condensed rings
    • C09K19/30—Non-steroidal liquid crystal compounds containing at least two non-condensed rings containing saturated or unsaturated non-aromatic rings, e.g. cyclohexane rings
    • C09K19/3001—Cyclohexane rings
    • C09K19/3003—Compounds containing at least two rings in which the different rings are directly linked (covalent bond)
    • C—CHEMISTRY; METALLURGY
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    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K19/00—Liquid crystal materials
    • C09K19/04—Liquid crystal materials characterised by the chemical structure of the liquid crystal components, e.g. by a specific unit
    • C09K19/42—Mixtures of liquid crystal compounds covered by two or more of the preceding groups C09K19/06 - C09K19/40
    • C09K19/44—Mixtures of liquid crystal compounds covered by two or more of the preceding groups C09K19/06 - C09K19/40 containing compounds with benzene rings directly linked
    • G—PHYSICS
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    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G—PHYSICS
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    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
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    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
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    • G02—OPTICS
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    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
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    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1337—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers
    • G02F1/133711—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers by organic films, e.g. polymeric films
    • G02F1/133723—Polyimide, polyamide-imide
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1337—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers
    • G02F1/13378—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers by treatment of the surface, e.g. embossing, rubbing or light irradiation
    • G02F1/133788—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers by treatment of the surface, e.g. embossing, rubbing or light irradiation by light irradiation, e.g. linearly polarised light photo-polymerisation
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1341—Filling or closing of cells
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
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    • G02F1/1333—Constructional arrangements; Manufacturing methods
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    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1343—Electrodes
    • G02F1/134309—Electrodes characterised by their geometrical arrangement
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/136—Liquid crystal cells structurally associated with a semi-conducting layer or substrate, e.g. cells forming part of an integrated circuit
    • G02F1/1362—Active matrix addressed cells
    • G02F1/1368—Active matrix addressed cells in which the switching element is a three-electrode device
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    • C09K19/00—Liquid crystal materials
    • C09K19/04—Liquid crystal materials characterised by the chemical structure of the liquid crystal components, e.g. by a specific unit
    • C09K19/06—Non-steroidal liquid crystal compounds
    • C09K19/08—Non-steroidal liquid crystal compounds containing at least two non-condensed rings
    • C09K19/10—Non-steroidal liquid crystal compounds containing at least two non-condensed rings containing at least two benzene rings
    • C09K19/12—Non-steroidal liquid crystal compounds containing at least two non-condensed rings containing at least two benzene rings at least two benzene rings directly linked, e.g. biphenyls
    • C09K2019/121—Compounds containing phenylene-1,4-diyl (-Ph-)
    • C09K2019/122—Ph-Ph
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    • C09K19/00—Liquid crystal materials
    • C09K19/04—Liquid crystal materials characterised by the chemical structure of the liquid crystal components, e.g. by a specific unit
    • C09K19/06—Non-steroidal liquid crystal compounds
    • C09K19/08—Non-steroidal liquid crystal compounds containing at least two non-condensed rings
    • C09K19/10—Non-steroidal liquid crystal compounds containing at least two non-condensed rings containing at least two benzene rings
    • C09K19/12—Non-steroidal liquid crystal compounds containing at least two non-condensed rings containing at least two benzene rings at least two benzene rings directly linked, e.g. biphenyls
    • C09K2019/121—Compounds containing phenylene-1,4-diyl (-Ph-)
    • C09K2019/123—Ph-Ph-Ph
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    • C09K19/06—Non-steroidal liquid crystal compounds
    • C09K19/08—Non-steroidal liquid crystal compounds containing at least two non-condensed rings
    • C09K19/30—Non-steroidal liquid crystal compounds containing at least two non-condensed rings containing saturated or unsaturated non-aromatic rings, e.g. cyclohexane rings
    • C09K19/3001—Cyclohexane rings
    • C09K19/3003—Compounds containing at least two rings in which the different rings are directly linked (covalent bond)
    • C09K2019/3004—Cy-Cy
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    • C09K19/06—Non-steroidal liquid crystal compounds
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    • C09K19/3003—Compounds containing at least two rings in which the different rings are directly linked (covalent bond)
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    • C09K19/04—Liquid crystal materials characterised by the chemical structure of the liquid crystal components, e.g. by a specific unit
    • C09K19/06—Non-steroidal liquid crystal compounds
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    • C09K19/06—Non-steroidal liquid crystal compounds
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    • C09K19/00—Liquid crystal materials
    • C09K19/04—Liquid crystal materials characterised by the chemical structure of the liquid crystal components, e.g. by a specific unit
    • C09K19/06—Non-steroidal liquid crystal compounds
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    • C09K19/3001—Cyclohexane rings
    • C09K19/3003—Compounds containing at least two rings in which the different rings are directly linked (covalent bond)
    • C09K2019/3027—Compounds comprising 1,4-cyclohexylene and 2,3-difluoro-1,4-phenylene
    • G—PHYSICS
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    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1341—Filling or closing of cells
    • G02F1/13415—Drop filling process
    • G02F2001/13415—

Definitions

  • the present invention relates to a liquid crystal display device useful as a constitutional member of a liquid crystal television or the like and a method for producing the liquid crystal display device.
  • Liquid crystal display devices are used in watches, calculators, various measuring instruments, automobile panels, word processors, electronic notepads, printers, computers, televisions, clocks, advertising boards, etc.
  • Representative examples of the types of liquid crystal displays are a twisted nematic (TN) type, a super twisted nematic (STN) type, a vertical alignment (VA) type that uses thin film transistors (TFTs), and an in-plane switching (IPS) type.
  • the liquid crystal compositions used in these liquid crystal display devices are required to be stable against outer factors such as moisture, air, heat, and light, stay in a liquid crystal phase in a temperature range as wide as possible about room temperature, exhibit a low viscosity, and operate at low driving voltage.
  • a liquid crystal composition is constituted by several to several tens of compounds in order to optimize the dielectric anisotropy ( ⁇ ), refractive index anisotropy ( ⁇ n), etc., for individual liquid crystal display devices.
  • a liquid crystal composition having a negative ⁇ is used.
  • the absolute value of ⁇ is required to be high
  • the viscosity ( ⁇ ) is required to be low
  • the nematic phase-isotropic liquid phase transition temperature (T ni ) is required to be high.
  • T ni nematic phase-isotropic liquid phase transition temperature
  • ⁇ n of the liquid crystal composition is adjusted to be in an appropriate range that suits the cell gap since the product ⁇ n ⁇ d of ⁇ n and a cell gap (d) is set.
  • high-speed response is important for liquid crystal display devices applied to televisions and the like and thus a liquid crystal composition having a low rotational viscosity ( ⁇ 1 ) is desired.
  • Multi-domain vertical alignment (MVA)-type liquid crystal display devices which are a type of VA displays with improved viewing angle characteristics are now widely used.
  • VVA liquid crystal display device projecting structures are formed on a substrate to divide a pixel so that the liquid crystal molecules are aligned in plural directions.
  • a MVA liquid crystal display device is advantageous in terms of viewing angle characteristics but has a problem in that liquid crystal molecules respond at different speeds between the portion near the projecting structure on the substrate and the portion remote from the projecting structure and thus the overall response speed has been insufficient due to the liquid crystal molecules that are remote from the projecting structure and slow in response. There has also been degradation of transmittance caused by the projecting structure.
  • PSA liquid crystal display devices (an example of which is a polymer stabilized (PS) liquid crystal display device) have been developed to provide uniform pretilt angles within each domain of a pixel without forming non-transmitting projecting structures in a cell, which is different from a typical MVA liquid crystal display device.
  • a PSA liquid crystal display device is produced by adding a small amount of a reactive monomer to a liquid crystal composition, introducing the liquid crystal composition to a liquid crystal cell, and polymerizing the reactive monomer in the liquid crystal composition by irradiation with an active energy ray.
  • pretilt angles can be provided in the divided pixel, and, as a result, improved contrast brought about by improved transmittance and a high-speed responsiveness caused by a uniform pretilt angle can be achieved (for example, refer to PTL 1).
  • a reactive monomer in a PSA liquid crystal display device, a reactive monomer must be added to a liquid crystal composition and this has caused many problems in active-matrix liquid crystal display devices that require a high voltage holding capacity. There has been another problem of display failure such as ghosting.
  • the alignment film material such as polyimide is designed to have a side chain reactive to ultraviolet light or the like and an alignment film is formed by using this material.
  • an active energy ray is applied while applying a voltage between electrodes so as to polymerize a reactive monomer in the alignment film (for example, refer to PTL 2 and PTL 3).
  • An object of the invention is to provide a liquid crystal display device that suppresses occurrence of drop marks during production without degrading various properties, such as dielectric anisotropy, viscosity, nematic phase upper limit temperature, rotational viscosity ( ⁇ 1 ), and ghosting property, and a method for producing the liquid crystal display device.
  • the inventors of the present invention have investigated on various combinations of liquid crystal compositions and method for providing pretilt angles to the molecules in liquid crystal display devices and found that these challenges can be overcome by using a particular liquid crystal composition in combination with a technique of polymerizing a reactive monomer in a vertical alignment film by applying an active energy ray while applying a voltage between electrodes after a liquid crystal composition is introduced into a liquid crystal cell.
  • the present invention has been made.
  • the present invention provides a liquid crystal display device comprising a first substrate that includes an electrode, a second substrate that includes an electrode, and a liquid crystal composition layer sandwiched between the first substrate and the second substrate, in which liquid crystal molecules in the liquid crystal composition layer are controlled by applying charges between the electrode of the first substrate and the electrode of the second substrate substantially vertically to the first substrate and the second substrate.
  • a vertical alignment film which controls an alignment direction of the liquid crystal molecules in the liquid crystal composition layer to be substantially vertical to a surface of the first substrate and a surface of the second substrate that are adjacent to the liquid crystal composition layer, is disposed on at least one of the first substrate and the second substrate, the vertical alignment film contains a polymer of a polymerizable compound having a polyimide skeleton as a main chain and a crosslinkable functional group as a side chain, and a liquid crystal composition constituting the liquid crystal composition layer contains a compound represented by general formula (I)
  • R 1 and R 2 each independently represent an alkyl group having 1 to 8 carbon atoms, an alkenyl group having 2 to 8 carbon atoms, an alkoxy group having 1 to 8 carbon atoms, or an alkenyloxy group having 2 to 8 carbon atoms;
  • A represents a 1,4-phenylene group or a trans-1,4-cyclohexylene group; l represents 1 or 2; and when l is 2, the two A may be the same or different from each other
  • R 3 represents an alkyl group having 1 to 8 carbon atoms, an alkenyl group having 2 to 8 carbon atoms, an alkoxy group having 1 to 8 carbon atoms, or an alkenyloxy group having 2 to 8 carbon atoms
  • R 4 represents an alkyl group having 1 to 8 carbon atoms, an alkenyl group having 4 to 8 carbon atoms, an alkoxy group having 1 to 8 carbon atoms, or an alkenyloxy group having 3 to 8 carbon atoms
  • B represents a 1,4-phenylene group or a trans-1,4-cyclohexylene group
  • m represents 0, 1, or 2; and when m is 2, the two B may be the same or different from each other).
  • the present invention also provides a method for producing a liquid crystal display device, the method comprising applying a vertical alignment material to at least one of a first substrate including a common electrode and a second substrate including a pixel electrode, the vertical alignment material containing a compound that has a thermosetting polyimide or soluble polyimide skeleton as a main chain and a crosslinkable functional group as a side chain; heating the applied vertical alignment material to form an alignment film; sandwiching a liquid crystal composition between the first substrate and the second substrate; irradiating the alignment film with an active energy ray while applying a voltage between the common electrode and the pixel electrode to polymerize a polymerizable compound in the alignment film.
  • the liquid crystal composition contains a compound represented by general formula (I)
  • R 1 and R 2 each independently represent an alkyl group having 1 to 8 carbon atoms, an alkenyl group having 2 to 8 carbon atoms, an alkoxy group having 1 to 8 carbon atoms, or an alkenyloxy group having 2 to 8 carbon atoms;
  • A represents a 1,4-phenylene group or a trans-1,4-cyclohexylene group; l represents 1 or 2; and when 1 is 2, the two A may be the same or different from each other
  • R 3 represents an alkyl group having 1 to 8 carbon atoms, an alkenyl group having 2 to 8 carbon atoms, an alkoxy group having 1 to 8 carbon atoms, or an alkenyloxy group having 2 to 8 carbon atoms
  • R 4 represents an alkyl group having 1 to 8 carbon atoms, an alkenyl group having 4 to 8 carbon atoms, an alkoxy group having 1 to 8 carbon atoms, or an alkenyloxy group having 3 to 8 carbon atoms
  • B represents a 1,4-phenylene group or a trans-1,4-cyclohexylene group
  • m represents 0, 1, or 2; and when m is 2, the two B may be the same or different from each other).
  • the liquid crystal display device has a high response speed, suppresses ghosting, and has fewer drop marks resulting from the production process.
  • the liquid crystal display device can be effectively used as a display device for liquid crystal TVs and monitors.
  • liquid crystal display devices can be produced efficiently while suppressing occurrence of drop marks.
  • FIG. 1 is a schematic perspective view showing an embodiment of a liquid crystal display device according to the present invention.
  • FIG. 2 is a schematic plan view showing an example of a slit electrode (comb-shape electrode) used in the liquid crystal display device according to the present invention.
  • FIG. 3 is a diagram showing the definition of a pretilt angle in the liquid crystal display device according to the present invention.
  • Embodiments of a liquid crystal display device and a method for producing the liquid crystal display device according to the present invention will now be described.
  • a liquid crystal display device of the present invention includes a liquid crystal composition layer sandwiched between a pair of substrates and is based on the principle that the liquid crystal molecules in the liquid crystal composition layer work as an optical switch under application of voltage by Freedericksz transition. With regard to this, a known technology can be used.
  • Two substrates have electrodes for causing liquid crystals to undergo Freedericksz transition.
  • a technique of vertically applying charges between the two substrates is employed.
  • one of the electrodes is configured as a common electrode and the other electrode is configured as a pixel electrode.
  • a typical embodiment that employs this technique is described below.
  • FIG. 1 is a schematic perspective view showing an embodiment of the liquid crystal display device according to the present invention.
  • a liquid crystal display device 10 includes a first substrate 11 ; a second substrate 12 ; a liquid crystal composition layer 13 sandwiched between the first substrate 11 and the second substrate 12 ; a common electrode 14 formed on a surface of the first substrate 11 , the surface facing the liquid crystal composition layer 13 ; a pixel electrode 15 formed on a surface of the second substrate 12 , the surface facing the liquid crystal composition layer 13 ; a vertical alignment film 16 formed on a surface of the common electrode 14 , the surface facing the liquid crystal composition layer 13 ; a vertical alignment film 17 formed on a surface of the pixel electrode 15 , the surface facing the liquid crystal composition layer 13 ; and a color filter 18 interposed between the first substrate 11 and the common electrode 14 .
  • Glass substrates or plastic substrates are used as the first substrate 11 and the second substrate 12 .
  • plastic substrate examples include substrates composed of a resin such as an acrylic resin, a methacrylic resin, polyethylene terephthalate, polycarbonate, or a cyclic olefin resin.
  • a resin such as an acrylic resin, a methacrylic resin, polyethylene terephthalate, polycarbonate, or a cyclic olefin resin.
  • the common electrode 14 is usually composed of a material, such as indium-doped tin oxide (ITO), that has transparency.
  • ITO indium-doped tin oxide
  • the pixel electrode 15 is usually composed of a material, such as indium-doped tin oxide (ITO), that has transparency.
  • ITO indium-doped tin oxide
  • the pixel electrode 15 formed on the second substrate 12 has a matrix shape.
  • the pixel electrode 15 is controlled by drain electrodes of active elements such as TFT switching elements.
  • the TFT switching elements have gate lines which are address signal lines and source lines which are data lines arranged in a matrix. In this description, the structure of the TFT switching elements is not illustrated in the drawings.
  • a pixel electrode that has slits (portions where no electrode is formed) in a stripe pattern or a V-shape pattern may be provided in the pixel.
  • FIG. 2 is a schematic plan view showing a typical geometry of a slit electrode (comb-shape electrode) for dividing a pixel into four domains. Since this slit electrode has comb-tooth slits extending in four directions from the center of the pixel, the liquid crystal molecules in the pixel that are vertically aligned relative to the substrate in the absence of an applied voltage will have their directors tilting in four different directions toward horizontal alignment under application of voltage. As a result, the liquid crystal molecules in the pixel align in plural different directions and thus a significantly wide viewing angle characteristic is achieved.
  • Examples of the method for dividing a pixel include, in addition to the method of forming slits in a pixel electrode, a method with which structures such as linear projections and the like are formed in a pixel and a method with which electrodes other than the pixel electrode and the common electrode are formed. Although these methods can also be used to align liquid crystal molecules in different directions, it is preferable to use a slit electrode from the viewpoints of transmittance and ease of manufacturing.
  • a pixel electrode having slits has no power to drive liquid crystal molecules in the absence of an applied voltage and thus a pretilt angle cannot be provided to the liquid crystal molecules.
  • a pretilt range can be provided.
  • a wide viewing angle can be achieved when the alignment film material is used in combination with a slit electrode that divides a pixel into domains.
  • having a pretilt angle refers to a state in which the director of liquid crystal molecules deviates slightly from a direction vertical to the substrate surface (the surface of the first substrate 11 or the surface of the second substrate 12 adjacent to the liquid crystal composition layer 13 ) in the absence of an applied voltage.
  • the liquid crystal display device of the present invention is a vertical alignment (VA)-type liquid crystal display device
  • the director of the liquid crystal molecules is aligned substantially vertically to the substrate surface in the absence of an applied voltage.
  • a vertical alignment film is usually used.
  • the material constituting the vertical alignment film include polyimide, polyamide, and polysiloxane. Among these, polyimide is preferable.
  • the vertical alignment film material may include a mesogenic moiety but is preferably free of mesogenic moieties unlike in the polymerizable compound described below.
  • the vertical alignment film material contains a mesogenic moiety, for example, ghosting caused by disturbance of the molecular alignment may result from repeated voltage application.
  • the vertical alignment film is to be composed of polyimide
  • a polyimide solution in which a mixture of tetracarboxylic dianhydride and a diisocyanate, polyamic acid, and polyimide are dissolved or dispersed in a solvent is preferably used.
  • the polyimide content in the polyimide solution is preferably 1 mass % or more and 10 mass % or less, more preferably 3 mass % or more and 5 mass % or less, and most preferably 10 mass % or less.
  • a polysiloxane solution prepared by dissolving polysiloxane produced by heating a mixture of a silicon compound having an alkoxy group, an alcohol derivative, and an oxalic acid derivative mixed at particular ratios can be used.
  • the vertical alignment film formed of polyimide or the like contains a polymer formed by polymerization of a polymerizable compound having a reactive group.
  • This polymerizable compound helps fix the pretilt angle of the liquid crystal molecules.
  • the directors of the liquid crystal molecules in the pixel can be made to tilt in different directions under application of voltage by using a slit electrode and the like.
  • the liquid crystal molecules are substantially vertically aligned relative to the substrate surface in the absence of an applied voltage and no pretilt angle is formed.
  • UV light or the like is applied while applying a voltage between the electrodes to slightly tilt the liquid crystal molecules so as to polymerize the reactive monomer in the liquid crystal composition and to provide an appropriate pretilt angle.
  • UV light or the like is applied while applying a voltage between the electrodes to slightly tilt the liquid crystal molecules so as to provide a pretilt angle as with the PSA method.
  • no polymerizable compound is contained in the liquid crystal composition.
  • a polymerizable compound having a reactive group is added to the vertical alignment film material such as polyimide or the like in advance, the liquid crystal composition is sandwiched between the substrates, and then the polymerizable compound is cured under application of voltage to provide pretilt angles. This is essentially different from the PSA method in that the phase separation of the polymerizable compound is not utilized.
  • substantially vertical refers to a state in which the director of vertically aligned liquid crystal molecules is slightly tilted from the vertical direction and has a pretilt angle. Assuming that the pretilt angle is 90° when the director is perfectly vertical and the pretilt angle is 0° when the alignment is homogeneous (horizontal to the substrate surface), substantially vertical preferably refers to an angle of 89 to 85° and more preferably 89 to 87°.
  • the vertical alignment film that contains a polymer of a polymerizable compound that has a reactive group is formed by an effect of the polymerizable compound added to the vertical alignment film material.
  • the vertical alignment film and the polymerizable compound are intricately entangled to form a type of a polymer alloy; however, its exact structure cannot be identified.
  • the polymerizable compound that has a reactive group is a compound that has a polyimide skeleton as a main chain and a crosslinkable functional group as a side chain. From the viewpoint of durability, the polymerizable compound having a reactive group is preferably a difunctional, trifunctional, or higher functional polymerizable compound having two or more reactive groups.
  • the reactive group of the polymerizable compound having a reactive group is preferably a photopolymerizable substituent.
  • the reactive group is preferably a photopolymerizable substituent since, in making a vertical alignment film by thermal polymerization by thermally polymerizing the vertical alignment film material, the reaction of the polymerizable compound having a reactive group can be suppressed.
  • the main chain of the polymerizable compound having a reactive group is preferably a thermosetting polyimide or a soluble polyimide.
  • the polymerizable compound having a reactive group is specifically preferably a polymerizable compound represented by general formula (V) below:
  • X 1 and X 2 each independently represent a hydrogen atom or a methyl group
  • Sp 1 and Sp 2 each independently represent a single bond, an alkylene group having 1 to 8 carbon atoms, or —O—(CH 2 ) s —
  • s represents an integer of 2 to 7 and the oxygen atom is to bond with an aromatic ring
  • U represents a linear or branched polyvalent alkylene group having 2 to 20 carbon atoms or a polyvalent cyclic substituent having 5 to 30 carbon atoms
  • an alkylene group in the polyvalent alkylene group may be substituted with an oxygen atom as long as the oxygen atoms are not adjacent to each other, or may be substituted with an alkyl group having 5 to 20 carbon atoms (an alkylene group in the group may be substituted with an oxygen atom as long as the oxygen atoms are not adjacent to each other) or a cyclic substituent
  • k represents an integer of 1 to 5.
  • X 1 and X 2 each independently represent a hydrogen atom or a methyl group. If the reaction speed is important, a hydrogen atom is preferable. If reducing the amount of reaction residues is important, a methyl group is preferable.
  • Sp 1 and Sp 2 each independently represent a single bond, an alkylene group having 1 to 8 carbon atoms, or —O—(CH 2 ) s — (in the formula, s represents an integer of 2 to 7 and the oxygen atom is to bond with an aromatic ring).
  • the carbon chain is preferably not long.
  • a single bond or an alkylene group having 1 to 5 carbon atoms is preferred.
  • a single bond or an alkylene group having 1 to 3 carbon atoms is more preferred.
  • Sp 1 and Sp 2 each represent —O—(CH 2 ) s —
  • s is preferably 1 to 5 and more preferably 1 to 3.
  • At least one of Sp 1 and Sp 2 is preferably a single bond. More preferably, both Sp 1 and Sp 2 are a single bond.
  • U represents a linear or branched polyvalent alkylene group having 2 to 20 carbon atoms or a multivalent cyclic substituent having 5 to 30 carbon atoms.
  • An alkylene groups in the polyvalent alkylene group may be substituted with an oxygen atom as long as the oxygen atoms are not adjacent to each other, or may be substituted with an alkyl group having 5 to 20 carbon atoms (an alkylene group in the group may be substituted with an oxygen atom as long as the oxygen atoms are not adjacent to each other) or a cyclic substituent.
  • the number of cyclic substituent is preferably 2 or more.
  • U specifically preferably represents any one of formulae (Va-1) to (Va-5) below, more preferably any one of formulae (Va-1) to (Va-3) below, and most preferably formula (Va-1).
  • each end is bonded to Sp 1 or Sp 2 .
  • At least one of Sp 1 and Sp 2 preferably represents a single bond. Preferably, both represent a single bond.
  • k represents an integer of 1 to 5.
  • a difunctional compound having k representing 1 or a trifunctional compound having k representing 2 is preferable, and a difunctional compound is more preferable.
  • X 1 and X 2 each independently represent a hydrogen atom or a methyl group
  • Sp 1 and Sp 2 each independently represent a single bond, an alkylene group having 1 to 8 carbon atoms, or —O—(CH 2 ) s —
  • Z 1 represents —OCH 2 —, —CH 2 O—, —COO—, —OCO—, —CF 2 O—, —OCF 2 —, —CH 2 CH 2 —, —CF 2 CF 2 —, —CH ⁇ CH—COO—, —CH ⁇ CH—OCO—, —COO—CH ⁇ CH—, —OCO—CH ⁇ CH—, —COO—CH 2 CH 2 —, —OCO—CH 2 CH 2 —, —CH 2 CH 2 —COO—, —CH 2 CH 2 —OCO—, —COO—CH 2 CH 2 —, —OCO—CH 2 CH 2 —, —CH 2 CH 2 —COO—,
  • X 1 and X 2 each independently represent a hydrogen atom or a methyl group.
  • a diacrylate derivative in which X 1 and X 2 each represent a hydrogen atom or a dimethacrylate derivative in which X 1 and X 2 each represent a methyl group is preferred.
  • a compound in which one of X 1 and X 2 represents a hydrogen atom and the other represents a methyl group is also preferable.
  • the diacrylate derivative is the highest, the dimethacrylate derivative is the lowest, and an unsymmetrical compound is intermediate.
  • a preferable compound is to be selected according to the usage.
  • a dimethacrylate derivative is particularly preferable.
  • Sp 1 and Sp 2 each independently represent a single bond, an alkylene group having 1 to 8 carbon atoms, or —O—(CH 2 ) s —.
  • at least one of Sp 1 and Sp 2 is preferably a single bond.
  • a compound in which both Sp 1 and Sp 2 represent a single bond or a compound in which one of Sp 1 and Sp 2 is a single bond and the other is an alkylene group having 1 to 8 carbon atoms or —O—(CH 2 ) s — is preferable.
  • an alkylene group having 1 to 4 carbon atoms is preferable and s is preferably 1 to 4.
  • Z 1 represents —OCH 2 —, —CH 2 O—, —COO—, —OCO—, —CF 2 O—, —OCF 2 —, —CH 2 CH 2 —, —CF 2 CF 2 —, —CH ⁇ CH—COO—, —CH ⁇ CH—OCO—, —COO—CH ⁇ CH—, —OCO—CH ⁇ CH—, —COO—CH 2 CH 2 —, —OCO—CH 2 CH 2 —, —CH 2 CH 2 —COO—, —CH 2 CH 2 —OCO—, —COO—CH 2 —, —OCO—CH 2 —, —CH 2 —OCO—, —CH 2 —OCO—, —CY 1 ⁇ CY 2 —, —C ⁇ C—, or a single bond.
  • Z 1 is preferably —OCH 2 —, —CH 2 O—, —COO—, —OCO—, —CF 2 O—, —OCF 2 —, —CH 2 CH 2 —, —CF 2 CF 2 —, or a single bond, more preferably —COO—, —OCO—, or a single bond, and most preferably a single bond.
  • C may be a 1,4-phenylene group that may have any hydrogen atom substituted with a fluorine atom, a trans-1,4-cyclohexylene group, or a single bond but is preferably a 1,4-phenylene group or a single bond.
  • Z 1 is preferably a linking group other than a single bond.
  • Z 1 is preferably a single bond.
  • the polymerizable compound having a cyclic structure is preferably any one of compounds represented by general formulae (V-1) to (V-6) below, more preferably any one of compounds represented by general formulae (V-1) to (V-4) below, and most preferably a compound represented by general formula (V-2) below.
  • the liquid crystal composition of the present invention preferably contains 30 to 65 mass %, more preferably 30 to 50 mass %, yet more preferably 35 to 45 mass %, and most preferably 38 to 42 mass % of a compound represented by general formula (I) below as a first component.
  • R 1 and R 2 each independently represent an alkyl group having 1 to 8 carbon atoms, an alkenyl group having 2 to 8 carbon atoms, an alkoxy group having 1 to 8 carbon atoms, or an alkenyloxy group having 2 to 8 carbon atoms;
  • A represents a 1,4-phenylene group or a trans-1,4-cyclohexylene group; l represents 1 or 2; and when l is 2, the two A may be the same or different from each other.
  • R 1 and R 2 each independently represent an alkyl group having 1 to 8 carbon atoms, an alkenyl group having 2 to 8 carbon atoms, an alkoxy group having 1 to 8 carbon atoms, or an alkenyloxy group having 2 to 8 carbon atoms.
  • R 1 and R 2 preferably each represent an alkyl group having 1 to 5 carbon atoms, an alkenyl group having 2 to 5 carbon atoms, an alkoxy group having 1 to 5 carbon atoms, or an alkenyloxy group having 2 to 5 carbon atoms.
  • R 1 and R 2 more preferably each represent an alkyl group having 2 to 5 carbon atoms, an alkenyl group having 2 to 4 carbon atoms, an alkoxy group having 1 to 4 carbon atoms, or an alkenyloxy group having 2 to 4 carbon atoms.
  • R 1 and R 2 most preferably each represent an alkyl group having 2 to 5 carbon atoms or an alkenyl group having 2 to 4 carbon atoms.
  • R 1 represents an alkyl group
  • an alkyl group having 1, 3, or 5 carbon atoms is particularly preferable.
  • R 1 represents an alkenyl group the following structures are preferable.
  • a vinyl group or a 1-propenyl group which is an alkenyl group having 2 or 3 carbon atoms is particularly preferable.
  • R 1 and R 2 may be the same or different from each other but are preferably different from each other.
  • R 1 and R 2 are an alkyl group, they are preferably alkyl groups having 1, 3, or 5 carbon atoms with numbers of carbon atoms different from each other.
  • the content of the compound represented by general formula (I) above in which at least one substituent selected from R 1 and R 2 is an alkyl group having 3 to 5 carbon atoms is preferably 50 mass % or more, more preferably 70 mass % or more, and most preferably 80 mass % or more of the compound represented by general formula (I) above.
  • the content of the compound represented by general formula (I) above in which at least one substituent selected from R 1 and R 2 is an alkyl group having 3 carbon atoms is preferably 50 mass % or more, more preferably 70 mass % or more, yet more preferably 80 mass % or more, and most preferably 100% of the compound represented by general formula (I) above.
  • A represents a 1,4-phenylene group or a trans-1,4-cyclohexylene group but preferably represents a trans-1,4-cyclohexylene group.
  • the content of the compound represented by general formula (I) in which A represents a trans-1,4-cyclohexylene group is preferably 50 mass % or more, more preferably 70 mass % or more, and most preferably 80 mass % or more of the compound represented by general formula (I).
  • the compound represented by general formula (I) is preferably any one of compounds represented by general formulae (Ia) to (Ik) below:
  • R 1 and R 2 each independently represent an alkyl group having 1 to 5 carbon atoms or an alkoxy group having 1 to 5 carbon atoms but the embodiments similar to R 1 and R 2 in general formula (I) are preferred.
  • general formulae (Ia) to (Ik) above general formulae (Ia), (Ib), and (Ig) are preferable and general formulae (Ia) and (Ig) are more preferable.
  • general formula (Ia) is particularly preferable.
  • general formula (Ib) is also preferable.
  • general formulae (Ib), (Ie), (If), and (Ih) are preferable.
  • the dialkenyl compounds represented by general formulae (Ie) and (If) are particularly preferable when the response speed is important.
  • the content of the compounds represented by general formulae (Ia) and (Ig) is preferably 50 mass % or more, more preferably 70 mass % or more, yet more preferably 80 mass % or more, and most preferably 100 mass % of the compound represented by general formula (I) above.
  • the content of the compound represented by general formula (Ia) above is preferably 50 mass % or more, more preferably 70 mass % or more, and most preferably 80 mass % or more of the compound represented by general formula (I).
  • the liquid crystal composition of the present invention preferably contains 5 to 20 mass %, more preferably 10 to 15 mass %, and most preferably 12 to 14 mass % of a compound represented by general formula (II-1) below as a second component.
  • R 3 represents an alkyl group having 1 to 8 carbon atoms, an alkenyl group having 2 to 8 carbon atoms, an alkoxy group having 1 to 8 carbon atoms, or an alkenyloxy group having 2 to 8 carbon atoms
  • R 4 represents an alkyl group having 1 to 8 carbon atoms, an alkenyl group having 4 to 8 carbon atoms, an alkoxy group having 1 to 8 carbon atoms, or an alkenyloxy group having 3 to 8 carbon atoms.
  • R 3 represents an alkyl group having 1 to 8 carbon atoms, an alkenyl group having 2 to 8 carbon atoms, an alkoxy group having 1 to 8 carbon atoms, or an alkenyloxy group having 2 to 8 carbon atoms.
  • R 3 preferably represents an alkyl group having 1 to 5 carbon atoms or an alkenyl group having 2 to 5 carbon atoms.
  • R 3 more preferably represents an alkyl group having 2 to 5 carbon atoms or an alkenyl group having 2 to 4 carbon atoms.
  • R 3 yet more preferably represents an alkyl group having 3 to 5 carbon atoms or an alkenyl group having 2 carbon atoms.
  • R 3 most preferably represents an alkyl group having 3 carbon atoms.
  • R 4 represents an alkyl group having 1 to 8 carbon atoms, an alkenyl group having 4 to 8 carbon atoms, an alkoxy group having 1 to 8 carbon atoms, or an alkenyloxy group having 3 to 8 carbon atoms.
  • R 4 preferably represents an alkyl group having 1 to 5 carbon atoms or an alkoxy group having 1 to 5 carbon atoms.
  • R 4 more preferably represents an alkyl group having 1 to 3 carbon atoms or an alkoxy group having 1 to 3 carbon atoms.
  • R 4 yet more preferably represents an alkyl group having 3 carbon atoms or an alkoxy group having 2 carbon atoms.
  • R 4 most preferably represents an alkoxy group having 2 carbon atoms.
  • the compound represented by general formula (II-1) above is specifically preferably a compound represented by general formula (II-1a) or (II-1b) below:
  • R 3 represents an alkyl group having 1 to 5 carbon atoms or an alkenyl group having 2 to 5 carbon atoms; and R 4a represents an alkyl group having 1 to 5 carbon atoms.
  • R 3 is preferably similar to embodiments for general formula (II-1) described above.
  • R 4a is preferably an alkyl group having 1 to 3 carbon atoms, more preferably an alkyl group having 1 or 2 carbon atoms, and most preferably an alkyl group having 2 carbon atoms.
  • R 3 is preferably similar to embodiments for general formula (II-1) described above.
  • R 4a is preferably an alkyl group having 1 to 3 carbon atoms, more preferably an alkyl group having 1 or 3 carbon atoms, and most preferably an alkyl group having 3 carbon atoms.
  • general formula (II-1a) and (II-1b) are preferable in order to increase the absolute value of the dielectric anisotropy.
  • the liquid crystal composition of the present invention preferably contains 25 to 45 mass %, more preferably 30 to 40 mass %, and most preferably 31 to 36 mass % of a compound represented by general formula (II-2) below as a third component.
  • R 3 represents an alkyl group having 1 to 8 carbon atoms, an alkenyl group having 2 to 8 carbon atoms, an alkoxy group having 1 to 8 carbon atoms, or an alkenyloxy group having 2 to 8 carbon atoms
  • R 4 represents an alkyl group having 1 to 8 carbon atoms, an alkenyl group having 4 to 8 carbon atoms, an alkoxy group having 1 to 8 carbon atoms, or an alkenyloxy group having 3 to 8 carbon atoms
  • B represents a 1,4-phenylene group or a trans-1,4-cyclohexylene group
  • m represents 0, 1, or 2.
  • R 5 represents an alkyl group having 1 to 8 carbon atoms, an alkenyl group having 2 to 8 carbon atoms, an alkoxy group having 1 to 8 carbon atoms, or an alkenyloxy group having 2 to 8 carbon atoms.
  • R 5 preferably represents an alkyl group having 1 to 5 carbon atoms or an alkenyl group having 2 to 5 carbon atoms.
  • R 5 more preferably represents an alkyl group having 2 to 5 carbon atoms or an alkenyl group having 2 to 4 carbon atoms.
  • R 5 more yet preferably represents an alkyl group having 3 to 5 carbon atoms or an alkenyl group having 2 carbon atoms.
  • R 5 most preferably represents an alkyl group having 3 carbon atoms.
  • R 6 represents an alkyl group having 1 to 8 carbon atoms, an alkenyl group having 4 to 8 carbon atoms, an alkoxy group having 1 to 8 carbon atoms, or an alkenyloxy group having 3 to 8 carbon atoms.
  • R 6 preferably represents an alkyl group having 1 to 5 carbon atoms or an alkoxy group having 1 to 5 carbon atoms.
  • R 6 more preferably represents an alkyl group having 1 to 3 carbon atoms or an alkoxy group having 1 to 3 carbon atoms.
  • R 6 yet more preferably represents an alkyl group having 3 carbon atoms or an alkoxy group having 2 carbon atoms.
  • R 6 most preferably represents an alkoxy group having 2 carbon atoms.
  • B represents a 1,4-phenylene group which may be substituted with fluorine or a trans-1,4-cyclohexylene group.
  • B preferably represents an unsubstituted 1,4-phenylene group or a trans-1,4-cyclohexylene group and more preferably a trans-1,4-cyclohexylene group.
  • the compound represented by general formula (II-2) above is preferably a compound represented by any one of general formulae (II-2a) to (II-2d) below.
  • R 5 represents an alkyl group having 1 to 5 carbon atoms or an alkenyl group having 2 to 5 carbon atoms
  • R 6a represents an alkyl group having 1 to 5 carbon atoms
  • R 5 and R 6a are preferably similar to embodiments of R 5 and R 6 in general formula (II-2).
  • R 5 is preferably similar to the embodiment in general formula (II-2).
  • R 6a is preferably an alkyl group having 1 to 3 carbon atoms, more preferably an alkyl group having 1 or 2 carbon atoms, and most preferably an alkyl group having 2 carbon atoms.
  • R 5 is preferably similar to the embodiment in general formula (II-2).
  • R 6a is preferably an alkyl group having 1 to 3 carbon atoms, more preferably an alkyl group having 1 or 3 carbon atoms, and most preferably an alkyl group having 3 carbon atoms.
  • general formula (II-2a) is preferred in order to increase the absolute value of the dielectric anisotropy.
  • general formula (II-2b) is preferred.
  • the liquid crystal composition of the present invention preferably contains 5 to 20 mass %, more preferably 8 to 15 mass %, and most preferably 10 to 13 mass % of a compound represented by general formula (III) below as a fourth component.
  • R 7 and R 8 each independently represent an alkyl group having 1 to 8 carbon atoms, an alkenyl group having 2 to 8 carbon atoms, an alkoxy group having 1 to 8 carbon atoms, or an alkenyloxy group having 2 to 8 carbon atoms;
  • Y 1 and Y 2 each independently represent a hydrogen atom or a fluorine atom;
  • D, E, and F each independently represent a 1,4-phenylene group or trans-1,4-cyclohexylene;
  • Z 2 represents a single bond, —OCH 2 —, —OCO—, —CH 2 O—, or —COO—; and n represents 0 or 1.
  • R 7 represents an alkyl group having 1 to 8 carbon atoms, an alkenyl group having 2 to 8 carbon atoms, an alkoxy group having 1 to 8 carbon atoms, or an alkenyloxy group having 2 to 8 carbon atoms.
  • R 7 preferably represents an alkyl group having 1 to 5 carbon atoms or an alkenyl group having 2 to 5 carbon atoms, more preferably represents an alkyl group having 2 to 5 carbon atoms or an alkenyl group having 2 to 4 carbon atoms, yet more preferably represents an alkyl group having 3 to 5 carbon atoms or an alkenyl group having 2 carbon atoms, and most preferably represents an alkyl group having 3 carbon atoms.
  • R 7 preferably represents an alkyl group having 1 to 5 carbon atoms or an alkenyl group having 4 or 5 carbon atoms, more preferably represents an alkyl group having 2 to 5 carbon atoms or an alkenyl group having 4 carbon atoms, and most preferably represents an alkyl group having 2 to 4 carbon atoms.
  • R 8 represents an alkyl group having 1 to 8 carbon atoms, an alkenyl group having 4 to 8 carbon atoms, an alkoxy group having 1 to 8 carbon atoms, or an alkenyloxy group having 3 to 8 carbon atoms.
  • R 8 preferably represents an alkyl group having 1 to 5 carbon atoms or an alkenyl group having 2 to 5 carbon atoms, more preferably represents an alkyl group having 2 to 5 carbon atoms or an alkenyl group having 2 to 4 carbon atoms, yet more preferably represents an alkyl group having 3 to 5 carbon atoms or an alkenyl group having 2 carbon atoms, and most preferably represents an alkyl group having 3 carbon atoms.
  • R 8 preferably represents an alkyl group having 1 to 5 carbon atoms or an alkenyl group having 4 or 5 carbon atoms, more preferably represents an alkyl group having 2 to 5 carbon atoms or an alkenyl group having 4 carbon atoms, and most preferably represents an alkyl group having 2 to 4 carbon atoms.
  • R 7 and R 8 each represent an alkenyl group and D or F bonded thereto represents a 1,4-phenylene group which may be substituted with fluorine in general formula (III), the alkenyl group having 4 or 5 carbon atoms preferably has a structure represented by a formula below:
  • an alkenyl group having 4 carbon atoms is more preferable.
  • Y 1 and Y 2 each independently represent a hydrogen atom or a fluorine atom.
  • at least one of Y 1 and Y 2 represents a fluorine atom.
  • both Y 1 and Y 2 preferably represent a fluorine atom.
  • D, E, and F each independently represent a 1,4-phenylene group, which may be substituted with fluorine, or trans-1,4-cyclohexylene but preferably represent an unsubstituted 1,4-phenylene group or trans-1,4-cyclohexylene.
  • Z 2 represents a single bond, —OCH 2 —, —OCO—, —CH 2 O—, or —COO—.
  • Z 2 preferably represents a single bond, —CH 2 O—, or —COO— and more preferably represents a single bond.
  • n 0 or 1.
  • Z 2 represents a substituent and not a single bond
  • n preferably represents 0.
  • the compound represented by general formula (III) with n representing 0 is specifically preferably a compound represented by any one of general formulae (III-1a) to (III-1h) below.
  • R 7 and R 8 each independently represent an alkyl group having 1 to 5 carbon atoms, an alkenyl group having 2 to 5 carbon atoms, or an alkoxy group having 1 to 5 carbon atoms but are preferably similar to the embodiments of R 7 and R 8 in general formula (III).
  • the compound represented by general formula (III) with n representing 1 is specifically preferably a compound represented by any one of general formulae (III-2a) to (III-2l) below.
  • R 7 and R 8 each independently represent an alkyl group having 1 to 5 carbon atoms, an alkenyl group having 2 to 5 carbon atoms, or an alkoxy group having 1 to 5 carbon atoms but are preferably similar to the embodiments of R 7 and R 8 in general formula (III).
  • the liquid crystal composition of the present invention is constituted by a combination of compounds represented by general formulae (I) to (III) above.
  • the contents of the respective compounds contained in combination are preferably as follows.
  • the compounds represented by general formulae (II-1) and (II-2) are each a compound having a negative dielectric anisotropy with a relatively large absolute value.
  • the total content of these compounds in the liquid crystal composition is preferably 30 to 65 mass %, more preferably 40 to 55 mass %, and most preferably 43 to 50 mass %.
  • the compound represented by general formula (III) above may have a positive dielectric anisotropy or a negative dielectric anisotropy.
  • the total content of the compounds represented by general formulae (II-1), (II-2), and (III) is preferably 35 to 70 mass %, more preferably 45 to 65 mass %, and most preferably 50 to 60 mass %.
  • the liquid crystal composition of the present invention preferably contains 30 to 50 mass % of a compound represented by general formula (I) above, and a total of 35 to 70 mass % of compounds represented by general formulae (II-1), (II-2), and (III).
  • the liquid crystal composition contains 35 to 45 mass % of a compound represented by general formula (I) above, and a total of 45 to 65 mass % of compounds represented by general formulae (II-1), (II-2), and (III).
  • the liquid crystal composition contains 38 to 42 mass % of a compound represented by general formula (I) above, a total of 50 to 60 mass % of compounds represented by general formulae (II-1), (II-2), and (III).
  • the total content of the compounds represented by general formulae (I), (II-1), (II-2), and (III) is preferably 80 to 100 mass %, more preferably 90 to 100 mass %, and most preferably 95 to 100 mass % relative to the entire liquid crystal composition.
  • the liquid crystal composition of the present invention can be used in a wide range of the nematic phase-isotropic liquid phase transition temperature (T ni ).
  • the nematic phase-isotropic liquid phase transition temperature (T ni ) is preferably 60 to 120° C., more preferably 70 to 100° C., and most preferably 70 to 85° C.
  • the dielectric anisotropy of the liquid crystal composition of the present invention is preferably ⁇ 2.0 to ⁇ 6.0, more preferably ⁇ 2.5 to ⁇ 5.0, and most preferably ⁇ 2.5 to ⁇ 3.5 at 25° C.
  • the refractive index anisotropy of the liquid crystal composition of the present invention is preferably 0.08 to 0.13 and more preferably 0.09 to 0.12 at 25° C.
  • the refractive index anisotropy of the liquid crystal composition of the present invention is preferably 0.10 to 0.12 at 25° C.
  • the refractive index anisotropy of the liquid crystal composition of the present invention is preferably 0.08 to 0.10 at 25° C.
  • An alignment material that contains a polymerizable compound having a reactive group and a vertical alignment material is applied to a surface of the first substrate 11 on which the common electrode 14 is formed and to a surface of the second substrate 12 on which the pixel electrode 15 is formed and heated to form the vertical alignment films 16 and 17 .
  • an alignment material that contains a polymer compound precursor (polymerizable compound) that forms a first polymer compound and a polymerizable compound such as a compound represented by general formula (V) or a photo-polymerizable or photo-crosslinkable compound is prepared.
  • the polymer compound precursor is, for example, a polyimide solution in which a mixture of tetracarboxylic dianhydride and a diisocyanate, polyamic acid, and polyimide are dissolved or dispersed in a solvent.
  • the polyimide content in the polyimide solution is preferably 1 mass % or more and 10 mass % or less and more preferably 3 mass % or more and 5 mass % or less.
  • the polymer compound precursor is, for example, a polysiloxane solution prepared by dissolving, in a solvent, polysiloxane produced by heating a mixture of a silicon compound having an alkoxy group, a silicon compound having a halogenated alkoxy group, an alcohol, and an oxalic acid derivative mixed at particular ratios.
  • a photo-crosslinkable compound a photopolymerization initiator, a solvent, and the like may be added to the alignment material.
  • the alignment material is applied to or printed on each of the first substrate 11 and the second substrate 12 so as to cover the common electrode 14 , and the pixel electrode 15 and slit portions (not shown in the drawing), and then subjected to a treatment such as heating.
  • a treatment such as heating.
  • the polymer compound precursor contained in the applied or printed alignment material is polymerized and cured to form a first polymer compound and vertical alignment films 16 and 17 that contain the first polymer compound and the polymerizable compound are formed.
  • the temperature is preferably 80° C. or higher and more preferably in the range of 150 to 200° C.
  • the alignment control portion that contains the first polymer compound is formed at this stage.
  • a treatment such as rubbing may be conducted after this as needed.
  • the first substrate 11 and the second substrate 12 are stacked and the liquid crystal composition layer 13 containing liquid crystal molecules is sealed in between the substrates.
  • spacer projections such as plastic beads for example, for securing the cell gap are scattered onto the surface of one of the first substrate 11 and the second substrate 12 on which the vertical alignment film 16 or 17 is formed and a sealing portion is printed by screen printing using an epoxy adhesive or the like.
  • first substrate 11 and the second substrate 12 are bonded to each other with the spacer projections and the sealing portion therebetween so that the vertical alignment films 16 and 17 face each other and then a liquid crystal composition containing liquid crystal molecules is poured.
  • the sealing portion is cured by heating or the like to seal in the liquid crystal composition between the first substrate 11 and the second substrate 12 .
  • voltage is applied between the common electrode 14 and the pixel electrode 15 by using voltage application means. For example, a voltage of 5 to 30 (V) is applied. As a result, an electric field is generated in a direction that forms a particular angle with the surface of the first substrate 11 adjacent to the liquid crystal composition layer 13 (the surface facing the liquid crystal composition layer 13 ) and the surface of the second substrate 12 adjacent to the liquid crystal composition layer 13 (surface facing the liquid crystal composition layer 13 ).
  • liquid crystal molecules 19 tilt in a particular direction from a normal direction of the first substrate 11 and the second substrate 12 .
  • the tilt angle of the liquid crystal molecules 19 is substantially equal to the pretilt angle provided to the liquid crystal molecules 19 in the step described below. Accordingly, the magnitude of the pretilt ⁇ of the liquid crystal molecules 19 can be controlled by appropriately adjusting the magnitude of the voltage (refer to FIG. 3 ).
  • ultraviolet light UV is applied to the liquid crystal composition layer 13 from the outer side of the first substrate 11 , for example, while applying the voltage so as to polymerize the polymerizable compound in the vertical alignment films 16 and 17 and form a second polymer compound.
  • the intensity of the ultraviolet light UV applied may be constant or varied.
  • the irradiation time at the respective strength may be any.
  • the irradiation intensity of the second stage and onward is preferably smaller than the irradiation intensity of the first stage.
  • the total irradiation time of the second stage and onward is preferably longer than the irradiation time of the first stage.
  • the total irradiation energy quantity of the second stage and onward is also preferably higher than that of the first stage.
  • the average irradiation intensity in the first half of the entire irradiation time is preferably larger than the average irradiation intensity in the second half.
  • the intensity immediately after start of irradiation is the highest. More preferably, the irradiation intensity keeps decreasing to a particular value with the passage of the irradiation time.
  • the ultraviolet light UV intensity in this case is preferably 2 mW/cm ⁇ 2 to 100 mW/cm ⁇ 2 .
  • the highest irradiation intensity in the first stage of multi-stage irradiation or in all irradiation stages in which the irradiation intensity is discontinuously varied is 10 mW/cm ⁇ 2 to 100 mW/cm ⁇ 2 ; and the lowest irradiation intensity in the second stage and onward of multi-stage irradiation or in discontinuously varying the irradiation intensity is 2 mW/cm ⁇ 2 to 50 mW/cm ⁇ 2 .
  • the total irradiation energy quantity is preferably 10 J to 300 J, more preferably 50 J to 250 J, and most preferably 100 J to 250 J.
  • the applied voltage may be AC or DC.
  • alignment regulating portions (not shown in the drawings) fixed to the alignment control portions of the vertical alignment film 16 and 17 and containing the second polymer compound are formed.
  • the alignment regulating portions provide a pretilt ⁇ to the liquid crystal molecules 19 located near the interfaces between the liquid crystal composition layer 13 and the vertical alignment film 16 and between the liquid crystal composition layer 13 and the vertical alignment film 17 in a non-operating state.
  • ultraviolet light UV is applied from the outer side of the first substrate 11 , it may be applied from the outer side of the second substrate 12 or from both the outer side of the first substrate 11 and the outer side of the second substrate 12 .
  • the liquid crystal molecules 19 in the liquid crystal composition layer 13 have a particular pretilt ⁇ .
  • the speed of response to the driving voltage can be significantly improved.
  • the polymer compound precursor constituting the vertical alignment films 16 and 17 is preferably a polyimide precursor that is not sensitive to light.
  • the content of the polymerizable compound, in particular, a compound represented by general formula (V) above is preferably 0.5 to 4 mass % and more preferably 1 to 2 mass % in the polymer compound precursor.
  • T ni , ⁇ n, ⁇ , ⁇ , and ⁇ 1 are defined as follows:
  • T ni Nematic phase-isotropic liquid phase transition temperature (° C.)
  • ⁇ n Refractive index anisotropy at 25° C.
  • Liquid crystal display devices of Examples and Comparative Examples below were evaluated by the following methods in terms of ghosting and drop marks.
  • a particular fixed pattern was displayed in a display area for 1000 hours and then an image is evenly displayed in all parts of the screen during which the level of the afterimage of the fixed pattern was observed with naked eye.
  • the ghosting level of the liquid crystal display device was evaluated in four grades as described below:
  • n represents —C n H 2n+1 (linear alkyl group with n carbon atoms).
  • On represents —OC n H 2n+1 (linear alkoxy group with n carbon atoms).
  • a first substrate that has a transparent electrode layer constituted by a transparent common electrode and a color filter layer and a second substrate (pixel electrode substrate) having a pixel electrode layer that includes transparent pixel electrodes driven by active elements were made.
  • Each pixel electrode of the pixel electrode substrate was made by etching ITO so that slits having no electrodes were formed in the pixel electrode to align liquid crystal molecules in different directions.
  • a vertical alignment film material that contains a polyimide precursor and a polymerizable compound having a reactive group was applied to each of the common electrode substrate and the pixel electrode substrate by a spin coating method.
  • the applied films were heated at 200° C. to cure the polyimide precursor in the vertical alignment film material and form a 100 nm vertical alignment film on a surface of each substrate.
  • the polymerizable compound having a reactive group contained in the vertical alignment film was not yet cured.
  • N-methyl-2-pyrrolidone solution containing 3% of a polyimide derivative represented by formula below and 3% of a polymerizable compound having a reactive group represented by formula (V-2) below was used as the vertical alignment film forming material.
  • a liquid crystal composition that contains compounds represented by chemical formulae below was sandwiched between the common electrode substrate and the pixel electrode substrate each with a vertical alignment film formed thereon. Then the sealing material was cured to form a liquid crystal composition layer. During this step, a spacer having a thickness of 4 ⁇ m was used to adjust the thickness of the liquid crystal composition layer to 4 ⁇ m.
  • compounds belonging to group (I) are compounds represented by general formula (I) above and compounds belonging to group (II) are compounds represented by general formula (II) above.
  • the liquid crystal display device obtained was irradiated with ultraviolet light while applying a square AC field to cure the polymerizable compound having a reactive group.
  • UIS-S2511RZ produced by Ushio Inc.
  • a UV lamp USH-250BY produced by Ushio Inc.
  • the liquid crystal display device was irradiated with ultraviolet light at 20 mW for 10 minutes to obtain a liquid crystal display device of Example 1.
  • a vertical alignment film containing a polymer of a polymerizable compound having a polyimide skeleton as a main chain and a crosslinkable functional group as a side chain was formed and a pretilt angle was provided to liquid crystal molecules in the liquid crystal composition layer.
  • the pretilt angle is defined as shown in FIG. 3 . If the molecules are aligned perfectly vertically, the pretilt angle ( ⁇ ) is 90°. When a pretilt angle is provided, the pretilt angle ( ⁇ ) is smaller than 90°.
  • the liquid crystal display device of Example 1 has pretilt angles in four different directions in four domains, respectively, formed along the slits of the pixel electrode shown in FIG. 2 .
  • the pretilt angles were retained after curing of the polymerizable compound even when the AC field was turned off.
  • the pretilt angle retained was 87°.
  • the liquid crystal display device of Example 1 obtained as such exhibited good response speed, suppressed drop marks, and exhibited good ghosting resistance as shown in Table 1.
  • a liquid crystal composition containing compounds represented by chemical formulae below was prepared and a liquid crystal display device of Comparative Example 1 was obtained as in Example 1 except that this liquid crystal composition was used.
  • the liquid crystal display device of Comparative Example 1 was evaluated in terms of ghosting and drop marks as in Example 1. The results are shown in Table 2.
  • a liquid crystal composition having a composition shown in Table 3 was prepared and a liquid crystal display device of Comparative Example 2 was obtained as in Example 1 except that this liquid crystal composition was used.
  • the liquid crystal display device of Comparative Example 2 was evaluated in terms of ghosting and drop marks as in Example 1. The results are shown in Table 3.
  • a liquid crystal composition having a composition shown in Table 4 was prepared and a liquid crystal display device of Comparative Example 3 was obtained as in Example 1 except that this liquid crystal composition was used.
  • the liquid crystal display device of Comparative Example 3 was evaluated in terms of ghosting and drop marks as in Example 1. The results are shown in Table 4.
  • a liquid crystal composition having a composition shown in Table 5 was prepared and a liquid crystal display device of Comparative Example 4 was obtained as in Example 1 except that this liquid crystal composition was used.
  • the liquid crystal display device of Comparative Example 4 was evaluated in terms of ghosting and drop marks as in Example 1. The results are shown in Table 5.
  • a liquid crystal composition having a composition shown in Table 6 was prepared and a liquid crystal display device of Comparative Example 5 was obtained as in Example 1 except that this liquid crystal composition was used.
  • the liquid crystal display device of Comparative Example 5 was evaluated in terms of ghosting and drop marks as in Example 1. The results are shown in Table 6.
  • a liquid crystal composition having a composition shown in Table 7 was prepared and a liquid crystal display device of Comparative Example 6 was obtained as in Example 1 except that this liquid crystal composition was used.
  • the liquid crystal display device of Comparative Example 6 was evaluated in terms of ghosting and drop marks as in Example 1. The results are shown in Table 7.
  • a liquid crystal display device of Example 2 was obtained as in Example 1 except that an N-methyl-pyrrolidone solution containing 3% of a polyimide derivative represented by formula below and 3% of a polymerizable compound having a reactive group represented by formula (V-3) below was used as the vertical alignment film forming material.
  • Example 2 The liquid crystal display device of Example 2 was evaluated in terms of ghosting and drop marks as in Example 1. The results are shown in Table 8.
  • Example 2 was slightly inferior to the liquid crystal display device of Example 1 but exhibited high response speed, suppressed drop marks, and was resistant to ghosting.
  • a liquid crystal display device of Example 3 was obtained as in Example 1 except that an N-methyl-2-pyrrolidone solution containing 3% of a polyimide derivative represented by formula below and 3% of a polymerizable compound having a reactive group represented by formula (V-4) below was used as the vertical alignment film forming material.
  • Example 3 The liquid crystal display device of Example 3 was evaluated in terms of ghosting and drop marks as in Example 1. The results are shown in Table 9.
  • Example 3 was slightly inferior to the liquid crystal display device of Example 1 but exhibited high response speed, suppressed drop marks, and was resistant to ghosting.
  • a liquid crystal display device of Example 4 was obtained as in Example 1 except that a liquid crystal composition having a composition shown in Table 10 was used as the liquid crystal composition.
  • Example 4 The liquid crystal display device of Example 4 was evaluated in terms of ghosting and drop marks as in Example 1. The results are shown in Table 10.
  • Example 4 was slightly inferior to the liquid crystal display device of Example 1 but exhibited relatively high response speed, suppressed drop marks, and was resistant to ghosting.
  • a liquid crystal display device of Example 5 was obtained as in Example 1 except that a liquid crystal composition having a composition shown in Table 11 was used as the liquid crystal composition.
  • Example 5 The liquid crystal display device of Example 5 was evaluated in terms of ghosting and drop marks as in Example 1. The results are shown in Table 11.
  • Example 5 was slightly inferior to the liquid crystal display device of Example 1 but exhibited relatively high response speed, suppressed drop marks, and was resistant to ghosting.
  • a liquid crystal display device of Example 6 was obtained as in Example 1 except that a liquid crystal composition having a composition shown in Table 12 was used as the liquid crystal composition.
  • Example 6 The liquid crystal display device of Example 6 was evaluated in terms of ghosting and drop marks as in Example 1. The results are shown in Table 12.
  • Example 6 was slightly inferior to the liquid crystal display device of Example 1 but exhibited relatively high response speed, suppressed drop marks, and was resistant to ghosting.
  • a liquid crystal display device of Example 7 was obtained as in Example 1 except that a liquid crystal composition having a composition shown in Table 13 was used as the liquid crystal composition.
  • Example 7 The liquid crystal display device of Example 7 was evaluated in terms of ghosting and drop marks as in Example 1. The results are shown in Table 13.
  • Example 7 was slightly inferior to the liquid crystal display device of Example 1 but exhibited relatively high response speed, suppressed drop marks, and was resistant to ghosting.
  • liquid crystal display device 11 first substrate, 12 second substrate, 13 liquid crystal composition layer, 14 common electrode, 15 pixel electrode, 16 vertical alignment film, 17 vertical alignment film, 18 color filter, 19 liquid crystal molecule

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